Sand-blast device



Patented Dec. 20, 1921.

2 SHEE S-SHEET I lialallllraniiill.

F. WASHBURN.

SAND BLAST DEVICE.

APPLICATION FILED JULY 2.1919.

1,400,585 Patented Dec. 20, 1921.

2 SHEETSSHEET 2- J2 J :Z0 I I V I 7 4% 4? l Afiy UNITED STATES PATENT OFFICE.

FRED WASHBURN, OF NEW HAVEN, CONNECTICUT; MARGARET A. WASHIBURN ADMINISTRATRIX OF SAID FRED WASHBURN, DECEASED.

SAND-BLAST DEVICE.

Specification of Letters Patent.

Patented Dec. 20, 1921.

Application filed July 2, 1919. Serial No. 308,229.

T 0 all whom it may concern:

Be it known that I, FRED IVAsHBUnN, a citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Sand Blast Devices, of which'the following is a specification, reference being bad therein to the accompanying drawings.

My invention relates to new and useful improvements in sand-blast devices, having particular reference to mechanism for treatment of a continuous or comparatively long article, such as wire, pipes, tubes, chains, etc., or for non-continuous or short articles if assembled for treatment on a continuous mechanism, such as a belt or carrier.

It is the object of this invention, among other things, to provide a simple and compact device of this character that will operate economically, efficiently and at the minimum expense, upon articles of the general character abOVG mGIItIOIIGd and which may be arranged in groups or batteries, as may be desired.

To these, and other ends, my invention consists in the improved sand-blast device having certain details of construction and combination of parts, as will be hereinafter described and more particularly pointed out in the claims.

Referring to the drawings, in which like numerals of reference designate like parts in the several figures;

Figure 1 is a side elevation of one of my improved sand-blast devices partly in section and with the near side cover removed;

Fig. 2 is a front view thereof showing the same grouped in a battery of three, the unit on the right being in section upon line 2-2 of Fig. 1, the middle unit having the fastening yoke mechanism removed, and the unit on the left being substantially complete and illustrating one method of supporting the devices; and

Fig. 3 is a horizontal sectional view of one of the units taken upon line 3-3 of Fig. 1.

ll of the units illustrated are alike, being assembled in groups or batteries in such numbers as economical operation and character of the work may dictate. The detail description of my invention therefor will relate only to a single unit, except as specially indicated.

The numeral 1 designates the frame of the machine, which is constructed with an inner curved face 2 and having an open throat 3 at the top thereof which is covered by a hood 4 having a collar 5 connected therewith. Through the top of the frame outslde of the hood 4 is an opening 6, which ls'closed by a hinged door 7. Fixed within the frame by the bolts 8 is a deflectm plate 9 having a curved face 10 adjacent to and opposite the said curved face 2, whereby there is formed therebetween an upwardly curved passageway 11. As shown, thls passageway is slightly wider at the bottom than at the top, but it may be of uniform wldth or arranged so that the degree of taper may be varied as desired.

Through the base of this deflecting plate is a dlscharge opening 12, which registers w1th an opening 13 in the frame 1, both opemngs forming an outlet for the sand wlthin the frame, originally admitted thereto through the opening 6. The open space between the inclined face 54 of the deflecting plate 9, and the wall 1 1 of the frame 1, provides a convenient pocket for the sand which is directed toward the discharge open ing 12.

The curved face 2 I prefer to cover with a rubber lining 15 to minimize wear upon the parts, as the sand striking against it will wear the parts lessby reason of its resilient qualities than upon a rigid metal surface. For purposes of economy, convenience and replacement of parts subject to the greatest wear, I so arrange the air and sand nozzle mechanisms that they may be readily inserted and taken out of the frame. As herein shown in one form of the embodiment of this invention, the numeral 16 designates the air head which is provided with an annular chamber 17 therein having a port 18 leading therefrom, and connected therewith is an air inlet pipe 19 communieating with any source of air supply under pressure. This air pipe 19 may be either rigid or flexible as may be preferred.

Arranged around the longitudinal central line of the air head 16, preferably at an angle thereto, are a plurality of alr ports 20 opening into the annular chamber 17, and threaded into the open ends thereof are the air nozzles 21 which project inwardly toward each other, from the inner end of said air head. In the drawings I have illussand head 22 is secured to the air head 16 by screws 23, or other convenient means with a sand chamber 24 therebetween, which is connected with the openings 12 and 13 by the opening 25, and into which project the air nozzles 21. The forward end of the sand head is supported upon a lug 31 integral with the frame.

Sand nozzle 26 is constructed with a conical head 27 which fits into a corresponding conical bore within the sand head 22- and through the center of which is an opening 28 having an outwardly flaring throat 29 at its inner end. This nozzle is secured within the sand head 22 by the nut 30 threaded in the end thereof.

As described and shown, it will be noted that the air and sand nozzles and the air and sand heads, with which they are associated, are combined into a unitary structure, and as the principal wear comes upon these parts, more particularly the sand noz zle, such replacements or adjustments as are necessary are economically and conveniently provided for by simply withdrawing this unitary structure from the frame and making such substitutions or alterations as are required by adjusting parts or inserting new ones, as may be desired.

Both the air and sand heads are rigidly V secured in place in the frame 1 by the yoke 32 which is hinged to the frame by the pintle 33 at one end, and separably secured thereto at the other end by the bolt 35 pivotally secured to lugs by the pintle 36 and with a nut 37 threaded thereon.

In Fig. 1 the air and sand heads are shown assembled in the machine with the yoke in its locked position, with the lugs 34 thereon in contact with said air head. To remove said headsthe'nut 37 is rotated uponthe bolt 35 which is then moved upwardly upon its pivot mounting until said nut has passed above the top of the yoke, at which time the yoke is moved upon the pintle 33 out of the path of said heads, which are then withdrawn.

Fitted. within the airy head 16 is a sleeve 38 having a longitudinal opening therethrough and through which passes the article, designated herein by the numeral 39, to be subjected to the sand blast.

In substantially the same horizontal plane as the sleeve 38 is an opening 40 in the lug 41 integral with the frame 1, which terminates at its outer end in a chamber 42 which is preferabl filled with packing 43, which is held in p ace and under the desired pressure by the cap 44 which .has an inclined outer face 45 in contact with the lugs 46 on said frame, having an inner face with a corresponding angle. Obviously, the extent of pressure upon the packing'43 will vary in accordance with the vertical position of the cap 44. This packing may be a single flexible block or composed of small particles as desired.

The sides of' the frame 1 are closed byplates 47 which are rigid if only a single unit is used, but lined with rubber or other flexible material. If several units are grouped together in a battery the dividing Walls between them are preferably rubber or similar material, this being designed as heretofore indicated for the purpose of minimizing wear upon the parts.

When assembled the units are preferably supported upon one or more legs 48, which are secured to lugs 49 on an outside metal plate 50. In the drawings the plates designated 47 are shown as the rubber plates, while 50 is the outside metal plate.

Mounted so as to slide upon the top of the base portion of the deflecting plate 9 is a closure slide 51 having an opening 52 therein which registers with the opening 12 and is.

moved laterally through a handle 53 connected therewith.

In operation, so much of the interior of the frame 1 as lies between the inclined face 54 of the deflector plate 9 and converging wall 14 of the frame 1 is filled with sand admitted through the opening 6 and when the opening 52 in the slide 51 registers with the openings 12, it passes by gravity through the said openings and the'opening 25 into the sand chamber 24, and air under pressure, which passes through'the air nozzle, 21, drives the sand against the article'39 as it passes therebetween, subjecting it to the desired sand treatment. The sand, after striking the article treated, within the open throat 29 of the sand nozzle 26, passes through the opening 28 in the shank of the nozzle and strikes against the rubber lining 15 in the frame and is deflected upwardly and drops back .into the sand pocket ready for reuse. The path of travel of the sand is substantially shown by the arrows in F ig.-

1. After the said treatment the article passes through an opening 55 in the lining 15, thence through the opening .40 and through the packing 43, which removes any excess sand and wipes off and cleans the article and thence out of the machine.

I prefer in the operation of this machine that the article to be treated should move in the direction shown by the arrow in Fig. 3, but if desired, and for some classes of work, the article can move through the machine in the opposite direction.

With the structure herein described, the article operated upon passes through the said nozzle wherein there is a confined space, gradually increasing in area at one end, and containmg, sand driven therethrough under pressure, which contacts with and scours the exterior of said article while in said confined space. The length of this space is such that the article is sub ected to the sand treatment for a comparatively long time, thereby enhancing the'eificiency of the device. The dust withm the frame "1 formed-by the movement of the sand therein is withdrawn by 'suctionthrough the throat 3 in the hood 4, thus making the process dustless.

Minor changes and alterations can be made within my invention, and I would therefore have it understood that I do not limit myself to, the exact construction herein shown and described, but claim all that'falls fairly within the spirit and scope of the appended claims.

\ Having described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a device of the character described, the combination with a frame partitioned so as to provide a sand pocket and an open passageway upon one side thereof; of means for guiding. an article to be sand treated below said sand pocket and through. a portion of said passageway; a member having a'sand chamber therein connected with said sand pocket; an air nozzle projecting into said sand chamber, means for admitting air under pressure to said air nozzle andthrough said sand chamber to said guiding means, whereby said sand is moved from said sand chamber through said guiding means, and open passageway and into saidsand pocket.

2. In a device of the character described, the combination with a member having a sand chamber therein; a member having a sand pocket adjacent thereto in a plane higher than said sand chamber for delivery of sand into said chamber; an air nozzle; means for admitting a supply of sand to said chamber in front of said nozzle; means for admitting air to said nozzle under pressure and through said nozzle to the sand withinsaid chamber; means for guiding an article to be sand treated through said chamber; and means for guiding said sand under said air pressure back to said sand pocket.

3. In a device of the character described, the combination with a frame member having a sand pocket upon one side of which is "a sand passage separated by a deflector plate; of a substantially horizontal sand nozzle; an

air nozzle; and means for admitting air under pressure to said air nozzle, the relative location of sa1d sand pocket and air nozzle being such that sand from said sand pocket is fed by gravity to said air nozzle at an an gle thereto, and the said air pressure returns the sand to said sand pocket through said said frame, having contact with said air head; and means for engaging said yoke and locking the same in its closed position.

5. In a device of the character described, the combination'with a frame memberhaving a curved interior wall; of a deflector plate within said frame having a curved wall opposite and adjacent to the said curved wall in said frame, said deflector plate being so arranged that a sand pocket is formed in said frame between one wall thereof and a face of said plate and a passageway between said curved walls; an air nozzle; and means for guiding an article to be sand treated ad-' jacent to said air nozzles.

4 6. In a device of the character described,

the combination with a frame member having a curved interior wall; of a deflector plate within said frame having a curved wall opposite and adjacent to the said curved wall in said frame, said deflector plate being so arranged that a sand pocket is formed in said frame between one wall thereof and a face of said plate and a passageway between said curved walls of an air nozzle arrangedv so as to be opposite the lower end of said passageway; and means for guiding an article to be sand treated adjacent-to said air nozzles.

In testimony aflixed my signature.

- FRED whereof, I have hereunto WASHBURN. 

